tftpd.1m (2010 09)

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tftpd(1M) tftpd(1M)

or a ﬁle. tftpd disallows a client access to any ﬁle that does not match entirely or in its initial

components one of the restriction path s. It also disallows access to any ﬁle path containing ‘‘

..’’.

However, an accessed ﬁle can be a symbolic link that points outside the set of restricted paths.

• If any path is speciﬁed on the command line and the

tftp home directory is deﬁned and is not /

tftpd ﬁrst looks for a ﬁle relative to (under) the home directory. If the ﬁle is not found there,

then tftpd looks for the ﬁle relative to

/ with path restrictions applied. Thus if two ﬁles with the

same name can be found in both locations,

tftpd accesses the one under tftp’s home directory.

Note that

inetd allows continuation of command lines in

inetd.conf by ending continued lines with

a backlash.

Deﬁning the

tftp pseudo-user is strongly recommended even when path s are speciﬁed, because client

access is further restricted to ﬁles that can be read and/or written by this pseudo-user. It is safe to set the

tftp pseudo-user’s home directory to

/ in this case.

DIAGNOSTICS

The following diagnostics are logged to the

syslogd facility at the err log level (see syslogd(1M)).

No security mechanism exists

The pseudo-user tftp was not found in the password database (

/etc/passwd), and tftpd

was invoked without any path arguments.

Add or correct the entry for the pseudo-user

tftp in the password database /etc/passwd.

Or, add an access list (path arguments) to the tftpd arguments in the inetd conﬁguration

ﬁle /etc/inetd.conf

. Reconﬁgure inetd with the command inetd -c.

Unknown option option ignored

An invalid option was speciﬁed in the tftpd arguments in the inetd conﬁguration ﬁle

/etc/inetd.conf.

Remove or correct the option. Restart

inetd with the command inetd -c.

Invalid total timeout value

The value given for the -T option was not a number or was a negative number.

Correct the value given for the

-T option. Reconﬁgure inetd with the command inetd -c

Invalid retransmission timeout

value

The value given for the

-R option was not a number or was a negative number.

Correct the value given for the

-R option. Reconﬁgure inetd with the command inetd -c

system call

The named system call failed. See the corresponding manual entry for a description of the sys-

tem call. The reason for the failure is explained in the error message appended to the system

call.

WARNINGS

When invoked with no path arguments,

tftpd cannot follow symbolic links that refer to paths outside of

the home directory of the pseudo-user tftp, because it performs a chroot().

AUTHOR

tftpd was developed by the University of California, Berkeley, and Hewlett-Packard.